Mistral: Enable USB in romstage

Enable USB support for mistral in romstage.

TEST=build & run

Change-Id: I5c2bbe16aa3601e014a2b77d192565402ed23794
Signed-off-by: Nitheesh Sekar <nsekar@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32063
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/src/mainboard/google/mistral/romstage.c b/src/mainboard/google/mistral/romstage.c
new file mode 100644
index 0000000000..41ee4edcbb
--- /dev/null
+++ b/src/mainboard/google/mistral/romstage.c
@@ -0,0 +1,31 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2018, The Linux Foundation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/stages.h>
+#include <soc/usb.h>
+
+static void prepare_usb(void)
+{
+	/*
+	 * Do DWC3 core and phy reset. Kick these resets off early
+	 * so they get atleast 1msec to settle.
+	 */
+	reset_usb(HSUSB_HS_PORT_1);
+}
+
+void platform_romstage_main(void)
+{
+	prepare_usb();
+}